The efficiency of nitrogen fertilizer can be increased through the use of slow release nitrogen fertilizer forms, which reduce the total amount of nitrogen needed, number of fertilizing application, and the residual of nitrogen fraction through the soil and the plant, cost of producing process and finally improve the efficiency of plant recovery and yield. Thus, a field experiment was carried out during two winter seasons at El- Ismailia Agric. Res. Station to study the efficiency of ureaform (UF) as slow release nitrogen fertilizer comparing with the traditional fast release nitrogen fertilizer (ammonium sulphate (AS) and ammonium nitrate (AN) ) applied at two rates (50% and75%N) from recommended dose and organic manures (compost and FYM) at a rate of 10m3fed-1 on some soil chemical characteristics, nutritional status of carrot and economic evaluation of nitrogen forms. Nitrogen forms in presence of organic manures had a positive effect on soil chemical properties such as decreasing of both EC and pH values and increasing both organic matter, and available macronutrients in the soil .Moreover, application of a (UF) at rate (75%N) combined with compost was superior to decrease values of EC and pH in soil and increase values of both organic matter and available macronutrients in the soil. Data also showed that the highest significant yield components of carrot as well as their total content of macronutrients due to the application of ureaform combined with compost as compared to other treatments. The economical evaluation of different treatments showed that the maximum net income, benefit cost ratio (BCR) obtained through application of UF at (75%N) combined with compost, while UF at (75%N) combined with FYM recorded the highest investment factor (IF).
Finally in similar conditions, application of UF as slow release fertilizer at a rate of (75%N) in presence of compost improved chemical properties and increased yield components of carrot as well as their total content of macronutrients and economically feasible